/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.common;

import java.util.concurrent.atomic.AtomicInteger;

import org.sss.mapreduce.SssException;

public class RefCountDataReceiver<T> extends BridgeDataReceiver<T, T> implements DataReceiver<T> {
  private AtomicInteger nRef;

  public RefCountDataReceiver(DataReceiver<T> substance, int n) {
    super(substance);
    this.nRef = new AtomicInteger(n);
  }

  @Override
  public void put(T data) throws SssException {
    substance.put(data);
  }

  @Override
  public void close() throws SssException {
    if (nRef.decrementAndGet() == 0) {
      super.close();
    }
  }
}
